(6)特回答貴公司某月某日函所敘述有關事項……

1. I have the pleasure of stating， in answer to your inquiry of the 4th inst， that

2. In reply to your letter of the 5th of May， I have to inform you that (of)

3. I hasten to answer your inquiry of the l5th May， by stating that

4. We are in receipt of yours of the 5th June， in reply to which we are pleased to state that

5. In reply to yours of the l0th May， relative to……， I would say that

6. I am in receipt of your favour of the 7th May， and in response I inform you that (of)

7. In response to your letter of l0th May， I wish to say that

8. In answer to your favour of the 5th May regarding…… I reply as follows：

9. Answering your letter of the 8th of February re……， I would say that

10. In reply to your letter of February 8th， I inform you that (of)

11. Replying to yours of the 8th of February regarding……， I would say that

12. Replying to your favour under date of February 8th re……， I say that